Electrical helix.



N0.`644,3|2. Patented Feb. 27, |900. J. c. ANDEnsoN.

ELECTRICAL HELIX.

(Application Bled Aug. 29, 1899.)

(Nu Model.)

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UNITED STATES PATENT Genion.

JAMES C.. ANDERSON, OF JERSEY CITY, NEW JERSEY.

ELECTRICAL HELIX.

SPECIFICATION forming part of Letters Patent No. 644,312, dated February 2'?, 1900.

Application tiled August Z9, 1899. Serial No. 728,843. (No model.)

T0 all whom it may con/cern:

Be it known that I, JAMES C. ANDERSON, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, havein vented certain new and useful Improvements in Electrical I-Ielices, of which the following is a full, clear, and exact description.

This invention relates to coils or helices for electrical purposes, the object being to provide a construction of coil which can be manu factured at low cost and which when made in quantities will be uniform with respect to resistance, size, shape, tbc., and adapted for use in various ways.

The invention consists of a plurality of coils or helices wound in layers upon separated zones ot' a single core, the layers being insulated by sheets of insulating material common to all ot' the coils or helices on the core. This will be described more fully in detail hereinafter with reference to the accompanying drawings, in which- Figure l is a side elevation of a number of helices wound according to my invention. Fig. 2 is a longitudinal section of what is shown in Fig. l. Fig. 3 is a side elevation of the core or tube, showing how the helices are started. Fig. 4 is a perspective View of an individual helix; and Fig. 5 is an enlarged View in section of a helix wound according to my invention, showing the disposition of the wires and insulating material.

a represents a tube, preferably ot paper and of su'ticient rigidity to support the helices. This tube may, however, be of any suitable insulating material. It is used as a spindle or core upon which to winda plurality of helices simultaneously, and for this purpose it may be mounted upon awinding-machine, where the winding may be done automatically, or it may be placed in a machine and manipulated partially by hand or, in so far as the in' vention is concerned, it may be manipulated or disposed in any manne-r so long as the winding operation is performed. Each of the helices may consist of one or more electrical conductors, and these conductors may be of ordinary insulated wire, as shown at e, or one or more of them may be of insulated wire, while the others may be of bare wire the convolutions of which will alternate with the insulated wire and so insulate'the convolutions of the coil, as shown at e2, or any number of bare wires may be wound in oonj unction with a thread of silk or other insulating material whose convolutions alternate with those of the bare wire, a single bare wire and a thread being shown at e and two bare wires and a thread at es. The last-mentioned plan is the one preferred, especially for fine-wire coils, because a greater length of wire may be Wound into a given space, thus increasing the efficiency of a coil for magnetic purposes, and the cost of insulating the wire beforev it is wound into the helix is avoided, and valso for other reasons which need not be mentioned herein.

For the sake of easy description I will assume all the helices to be composed of bare wire alternately wound with a silk thread. To start a helix, a tongue a is formed in the side of the tube a by cutting slantingly through its wall. The two ends of the thread and wire are then passed under the tongue and bent back, as shown in Fig. 3, to hold the inner end of the helix, the wire and thread being thus exposed on the interior of the tube. This operation is repeated for each of the helices which are to be simultaneously wound onto the tube, the second cut being made somewhat beyond the point where the first helix ends and the third cut at a point beyond where the second helix ends, and so on throughout the length of the tube. The wire and thread from each point of attachment will lead off separately to the spools supplyin g the material. The tubeis then rotated and either the wire and thread fed along the face of the tube to form a layer thereon or the tube itself is fed with respect to the Wire and thread for this purpose. In either case the formation of the layer continues until within a short distance-say a quarter of an inchfrom the beginning-points of the several coils, when the rotation is stopped long enough to wrap a sheet of paper b of such Width as to cover all of the layers and of such length as to entirely surround the tube and slightly overlap. The tube is then again rotated and vthe second layer formed by reversing the travel of the wire andthread or of the tube, as the case may be. The second and succeeding layers will be wound over the iirst, and

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at the completion of each layer the wrappin g ofinsulatingmaterialwillbeinserted. When the coils are finished, a few extra turns are wound on each over the last layer of paper for connecting purposes and the loose ends secured to the side of the helix by a short strip of gummed paper c. The structure thus linislied consists of a number of helices wound upon separated Zones of the core and mechanically connected together by the core and the successive layers of paper, and to separate them into individual helices it is only necessary to sever the paper along the lines fr y by means of a saw or knife and thus produce the article illustrated in Fig. 4. The inner ends of the individual helix may be reached and pulled out for connecting by means of a small hook, such as a crochet-hook, passed into the tube and caught over the wires which are exposed under the tongue a. Then the coil has been shellacked, it is ready to be placed upon a spool or directly upon its iron magnetic core.

My invention is not limited to the exact method described of building up the coils. The insertion of the paper, forinstance, might be accomplished Without stopping the rotation of the tube. Likewise the paper might be inserted in separate sheets for each helix and the stability and strength of the inner tube relied upon to hold the helices together until the winding is completed, after which the tube only would have to be severed. The operation of severing the helices may be performed either by the maufacturer or user. The layer of paper, besides furnishinginsulation, also promotes uniformity in the construction of the coils, since it furnishes an even surface upon which to Wind the layer. This fact also insures a uniform amount of wire and a better coil for electrical purposes. The ends of the helices where they are caught under the tongues may be left long and brought out to a convenient point and there connected in any desired manner with each other, as in series, parallel, or differential relation to meet the conditions under which they are to be used, this of course referring to the use of a number of the helices on the single tube, the act of severing them into individual coils being omitted.

Having described my invention, I claiml. An article of manufacture consisting of a plurality of helices for electrical purposes, Wound in layers on a single core, in combination with individual sheets of insulating lnaterial inserted between the layers and extending throughout all the helices, substantially as described.

2. An article of manufacture consisting of a plurality of helices for electrical purposes, Wound in layers on separated Zones of a single core, in combination with layers of insulating materia-l alternating with the layers of the helices and being common to all the helices, substantially as described.

In witness whereof I subscribe my signature in presence of two witnesses.

JAMES C. ANDERSON. l/Vitnesses:

WM. A. RosENBAUi/r, FRANK S. OBER. 

